Is there an app that can change the color of the text bubbles? Currently, mine are blue for iMessage, and ugly green for the rest. Or is there a setting that I can change to adjust the colors?
What you are thinking of is more of an "Unlock" so it can be used on other networks.
A Jailbreak (which I am desperately waiting for) is basically putting your phone into Administrator mode like on a computer. Stock they are locked down so there is very little you can change and Apple controls what apps you have access to. After a Jailbreak, you have access to MANY more apps and much more control over the settings on your phone.